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Sorry, KO= knock off HT = Holy Trainer. https://www.amazon.com/FYJENNICC-Chastity-Breathable-Transparent-Underwear/dp/B08GM94MF6/ref=mp_s_a_1_15?c=ts&keywords=Chastity+Devices&qid=1651606075&s=hpc&sr=1-15&ts_id=1243841011
That's the cage I modified.
It's either this one or something very similar. Basically just another cheap clone but those newer ones are actually not bad.
In terms of shape, size and overall design it's the most comfortable I've tried. I feel like the ring sizes aren't quite perfect for me, but that's a very individual thing.